Error Codes (Thanks Turbo)
After putting rocker back in, spark plugs and new coolant temp sensor

If I read it right.
on off on off on...then saw

1 (Pause) 2 (Pause) 2 (Pause) 4 (Pause) 2 (Pause) 1 (Pause) 5 (Pause) 5

So I'm thinking that means:

1-2
2-4
2-1

 

Might want to try pulling them again, because they will go in order. Sometimes the pauses will be different legenths but the longer lengths are the pause inbetween the two codes. Code 12 just means the battery has been plugged in recently. Here is a site that goes more indepth on how to pull the codes and what they mean http://www.allpar.com/fix/80s-codes.htmlGood luck!

 

That nails it....thanks

Looks like the battery was disconnected....need a new O2 sensor and TPS

How do I perform a reset?
Thanks again for the help.

 

Resetting the computer is pretty trick you have to take it to a dealer they charge about $500 for it...

Just kidding , you justunplug the negative side of the battery for about 30 seconds(altought I wouldn't be surprised if the dealership charged that)

 

Neat trick here on ecm reset....
dissconnect the POS cable , and connect to the NEG ....for 3 or so minutes
As electron flow goes NEG to POS.....this will discharge all of the capacitors
in the ecm (caps act like a small "battery" and hence retain the " learned " parameters)
And force the ecm to revert to the prom base functions.and "relearn" all parameters.

also your code read is....12 24 21 55

12....battery dissconnect (last 30-100 key cycles...lol ..nebulous at best)
24....t/p sensor...set code if above 4.7v or below .16v
21.... O/2 sensor no "switch" (above or below .5v for 2-12 min, again "vague" at best)
55....end of code sequence